Grinding machine for oil, varnish, and other paints



June 24 1924.

G. LENART ET Al.

GRINDING MACHINE FOR OIL., vARNIsH, AND o THER PAINTS Filed Nov. l5 1922 Patented .lune 24, 1924.

unirse STATES Gaone Lananr, or-BonN-oN-rnnnnnvn, AND

GERMANY.

rant LENART, or DARMSTADT,

GRIND'ING MACHINE I'OR OIL, VARNISH, AND PAINTS. l

Application tiled November 13, 1922. Serial No.y 600,729.

To all whom t may concern.'

Be it known that we, Dr. GnoRG LENART,

a citizen of Hungary, residing at 222 Bornhcin'ier St., in the city of Bonn-on-the s Rhine, Germany, and PAULLENART, a citi zen o-f Hungary, residing at 27 Grafen St., in the city of Darmstadt, Germany, have jointly invented'a new and useful Grinding Machine for Oil, Varnish, and Other Paints, of which the following is a specification.r

-Our invention relates to paint 4,grinding inachines for powdering oil and varnish pai-nts and other paints. With these machines it has been customary to have a Irotary grinding disk moving opposite a stationary grinding disk with a certain speed, the powdered paint being carried away by the use of stripping knives. It has been customary to feed the goods to be ground by means of a funnel. In consequence of the low viscosity of the material to be ground and on account of its glueyness while being drained from the machine, the efficiency of these machines is comparatively very low. An attempt could be made to increase the eiiic-iency of the machine by increasing its rotary speed, but this attempt would be bound to fail, principally because the resistance of the ground material would increase, being accumulated by its in- 30 ertia.

The object of this invention is to overcome these troubles by constructing the grinding machine in such a way that it is made part of a centrifugal pump, or by constructing a centrifugal pump, which is a'grinder at the same time. It is a known fact that centrifugal pumps can handle heavy liquids easily. This is due to the fact that the material to be pumped is sucked up automatically and that it is thrown by centrifugal force into a pipe of constantly increasing size. According to our invention grinding disks will be arranged to take the place of the pump wings of both the pump housing and the centrifugal wheel. The pulverized and liquid pulp forming the oil or varnish paint will be ground by the disks and thrown out centrifugally. Our improvement may be applied to both one faced and two faced centrifugal pumps, in the latter case two opposed grinding disks operating and rotating opposite two stationary grinding disks, of the housing.

In consequence of the high velocity required for centrifugal pumps in addition to the friction required for the grinding, the amount of heat developed will be comparatively large. In order to reduce this heat, the housing of the centrifugal grinding mill may be cooled correspondingly, as well as the rotor. f

In order to obtain an even efficiency, it will be necessary, .to have an adjustable spring `or weight govern the pressure `of the grinding disks against onelanother. G5

Iny the accompanying drawing the mechanism is illustrated. F ig.1iisa plan, Fig. 2 is a longitudinal section,land Fig.` 3 a side elevation. y

he frame 1 carries two bearings, 2 and 3, also .the housing-4 Aof the centrifugal pump, whose left ,half 6 :is pivoted at f5, and which is held tight by the swing bolts 7. On the inside a grinding disk 10 has been provided, which may be removed for repair or renewal. The centrifugal wheel 8 is `keyed to the hollow shafting 9, being supported by two bearings 2 and 3, the face of the rotor opposite the outer casing 6 being lined, as well as its cooperating surface with an interchangeable grinding disk 11. A helical spring 12 has been provided in order to press the two grinding disks together. One end of this spring bears against the ball bearing collar 13 of the hollow shaft. The other end bears against a sleeve 14 clearing the shaft 9 and provided with a male thread, the bearing 3 forming the nut 15. The tension of the helical spring 12 may be altered by screwing the sleeve 14 out of or into the nut 15. The` left half of the housing 6 has been made hollow for cooling purposes and has been provided with a water inlet 16 and an outlet 17. The rotor 8 may also be made hollow for cooling purposes. In this case the drive shaft may be made hollow and provided with a system of pipes connected to an inlet 19 and discharge 20. The lines 19 and 20 may be separated from one another and from the hollow shaft by any suitable 100 u packing.

, rlhe material to be ground is admitted through the inlet Q2 and is sucked up by a set of wings of ordinary design, visible in Figs. 2 and 3, and partly protruding into 105 the inlet22. The ground material is carried away through the discharge pipe 23 of constantly increasing size, as is customary in all centrifugal pumps.

By fitting the pulp grinder into acentrifu- M0 gal pump or by designing a centrifugal pump, which acts as a pulp grinder at the same time, We obtain a higher efficiency With thev same grinding disk diameter, in comparison to other designs. The power consumed per hour will be slightly larger in this machine than in other designs, but the efficiency Will increase many times in com parison.

Claims.

l. In a triturating and homogenizing machine for paints, a casing, a plurality of relatively moving cooperating friction surfaces Within said casing, yieldable means tending to maintain said surfaces in mutual contact, a centrifugal pump Within said casing for drawing in the paint to be treated and impelling it between said friction surfacesagainst the resistance of said yieldable means, and auxiliary means for cooling said friction surfaces.

2. In a triturating and homogenizing machine for paints, a casing, a plurality of relatively moving cooperating friction surfaces Within said casing, yieldable means tending to maintain said surfaces in mutual contact, a centrifugal pump Within said casing for drawing in the paint to be treated and impelling it between said friction surfaces against the resistance of said yieldable means, and chambersl for a cooling medium adjacent said friction surfaces.

3. In a triturating and homogenizing ma chine for paints, a rotatable head, cooperating friction 4surfaces on the casing of the machine and on said rotatable head respectively, centrifugal pump impellers arranged on said rotatable head in radial relation to the axis thereof, said pump being in ad- Vance of said friction members relative to the incoming liquid, a shaft for rotating said rotatable head, a chamber for a cooling medium in said head, and means for circulating the cooling medium therein comprising influent and effluent passagesin said shaft.

The foregoing specification signed at Cologne, Germany, this 18th day of October,

DR.. GEORG LENART. PAUL LENART.

In presence of tivo Witnesses:

H. FIRNDENY, E. LIND. 

